Add Debian package registry (#22854)

Co-authored-by: @awkwardbunny

This PR adds a Debian package registry. You can follow [this
tutorial](https://www.baeldung.com/linux/create-debian-package) to build
a *.deb package for testing. Source packages are not supported at the
moment and I did not find documentation of the architecture "all" and
how these packages should be treated.

---------

Co-authored-by: Brian Hong <brian@hongs.me>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

routers/api/packages/swift/swift.go

@@ -300,7 +300,7 @@ func UploadPackageFile(ctx *context.Context) {
 	}
 	defer file.Close()
 
-	buf, err := packages_module.CreateHashedBufferFromReader(file, 32*1024*1024)
+	buf, err := packages_module.CreateHashedBufferFromReader(file)
 	if err != nil {
 		apiError(ctx, http.StatusInternalServerError, err)
 		return